It looks like this is related to Clirr handling default methods the
wrong
way. So we probably need to fix clirr in order to use it. I found a
mirror
of the code on GitHub in Emmanuel Bourg's account [1]. We could
probably
try to fix clirr, but I'd like to explore whether it would be okay to
drop
clirr entirely and only use jacimp instead (which seems to work with
Java

8).

Japicmp has its own problems; it had to be disabled so that
"Commons RNG" could be released.
Gilles